(As I start to make the drink, I turn to look at the woman and notice that she is slowly making her way behind the counter.)

Me: “Uh, ma’am…”

(The woman proceeds to walk behind the counter, walk to a sink, wash her hands, wipe her hands, throw the paper towel away, and then walk right back around the counter and straight out the door. As my coworkers and I attempt to figure out what just happened, we watch her walk by the drive-thru window, around the building, around the building NEXT to our store, and then back into the store. The woman then approaches the counter.)